This
last book within Go Rin No Sho is the shortest, and perhaps the
most difficult to understand. It talks of void or emptiness. However,
this emptiness is not that of a vacuum or an absence. It is a space
of possibility. Not where there is nothing, but where many things could
be.

Musashi
writes that the ignorant are sure of themselves, convinced that "their"
way is the "true" way. One who understands his Heiho
continually hones their skills, is always seeking to learn more, having
no illusions.

The
study of a true Martial Art (as opposed to a martial sport), is a never
ending quest for self improvement in spiritual as well as physical terms.